<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录</title>

    <link rel="stylesheet" href="https://cdn.acwing.com/static/jquery-ui-dist/jquery-ui.min.css">
    <script src="https://cdn.acwing.com/static/jquery/js/jquery-3.3.1.min.js"></script>
    <link rel="icon" href="https://gitee.com/liuyutaocode/tao-blog-image/raw/master/img/icon.png">

    <style>

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* 使用flex布局，让内容垂直和水平居中 */

        section {
            /* 相对定位 */
            position: relative;
            overflow: hidden;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            /* linear-gradient() 函数用于创建一个表示两种或多种颜色线性渐变的图片 */
            background: linear-gradient(to bottom, #f1f4f9, #dff1ff);
        }

        /* 背景颜色 */

        section .color {
            /* 绝对定位 */
            position: absolute;
            /* 使用filter(滤镜) 属性，给图像设置高斯模糊*/
            filter: blur(200px);
        }

        /* :nth-child(n) 选择器匹配父元素中的第 n 个子元素 */

        section .color:nth-child(1) {
            top: -350px;
            width: 600px;
            height: 600px;
            background: #ff359b;
        }

        section .color:nth-child(2) {
            bottom: -150px;
            left: 100px;
            width: 500px;
            height: 500px;
            background: #fffd87;
        }

        section .color:nth-child(3) {
            bottom: 50px;
            right: 100px;
            width: 500px;
            height: 500px;
            background: #00d2ff;
        }

        .box {
            position: relative;
        }

        /* 背景圆样式 */

        .box .circle {
            position: absolute;
            background: rgba(255, 255, 255, 0.1);
            /* backdrop-filter属性为一个元素后面区域添加模糊效果 */
            backdrop-filter: blur(5px);
            box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.5);
            border-right: 1px solid rgba(255, 255, 255, 0.2);
            border-bottom: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            /* 使用filter(滤镜) 属性，改变颜色。
            hue-rotate(deg)  给图像应用色相旋转
            calc() 函数用于动态计算长度值
            var() 函数调用自定义的CSS属性值x*/
            filter: hue-rotate(calc(var(--x) * 70deg));
            /* 调用动画animate，需要10s完成动画，
            linear表示动画从头到尾的速度是相同的，
            infinite指定动画应该循环播放无限次*/
            animation: animate 10s linear infinite;
            /* 动态计算动画延迟几秒播放 */
            animation-delay: calc(var(--x) * -1s);
        }

        /* 背景圆动画 */

        @keyframes animate {
            0%, 100%{
                transform: translateY(-50px);
            }
            50% {
                transform: translateY(50px);
            }
        }

        .box .circle:nth-child(1) {
            top: -50px;
            right: -60px;
            width: 100px;
            height: 100px;
        }

        .box .circle:nth-child(2) {
            top: 150px;
            left: -100px;
            width: 120px;
            height: 120px;
            z-index: 2;
        }

        .box .circle:nth-child(3) {
            bottom: 50px;
            right: -60px;
            width: 80px;
            height: 80px;
            z-index: 2;
        }

        .box .circle:nth-child(4) {
            bottom: -80px;
            left: 100px;
            width: 60px;
            height: 60px;
        }

        .box .circle:nth-child(5) {
            top: -80px;
            left: 140px;
            width: 60px;
            height: 60px;
        }

        /* 登录框样式 */

        .container {
            position: relative;
            width: 400px;
            min-height: 400px;
            background: rgba(255, 255, 255, 0.1);
            display: flex;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(5px);
            box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.5);
            border-right: 1px solid rgba(255, 255, 255, 0.2);
            border-bottom: 1px solid rgba(255, 255, 255, 0.2);
        }

        .form {
            position: relative;
            width: 100%;
            height: 100%;
            padding: 50px;
        }

        /* 登录标题样式 */

        .form h2 {
            position: relative;
            color: #fff;
            font-size: 24px;
            font-weight: 600;
            letter-spacing: 5px;
            margin-bottom: 30px;
            cursor: pointer;
        }

        /* 登录标题的下划线样式 */

        .form h2::before {
            content: "";
            position: absolute;
            left: 0;
            bottom: -10px;
            width: 0px;
            height: 3px;
            background: #fff;
            transition: 0.5s;
        }

        .form h2:hover:before {
            width: 53px;
        }

        .form .inputBox {
            width: 100%;
            margin-top: 20px;
        }

        /* 输入框样式 */

        .form .inputBox input {
            width: 100%;
            padding: 10px 20px;
            background: rgba(255, 255, 255, 0.2);
            outline: none;
            border: none;
            border-radius: 30px;
            border: 1px solid rgba(255, 255, 255, 0.5);
            border-right: 1px solid rgba(255, 255, 255, 0.2);
            border-bottom: 1px solid rgba(255, 255, 255, 0.2);
            font-size: 16px;
            letter-spacing: 1px;
            color: #fff;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }

        .form .inputBox input::placeholder {
            color: #fff;
        }

        /* 登录按钮样式 */

        .form .inputBox input[type="submit"] {
            background: #fff;
            color: #666;
            max-width: 100px;
            margin-bottom: 20px;
            font-weight: 600;
            cursor: pointer;
        }

        .forget {
            margin-top: 6px;
            color: #fff;
            letter-spacing: 1px;
        }

        .forget a {
            color: #fff;
            font-weight: 600;
            text-decoration: none;
        }
    </style>
</head>

<body>
<%--在web-inf下面的所有页面或者资源，只能通过controller或者Servlet进行访问--%>

<script type="text/javascript">

</script>
<section>
    <!-- 背景颜色 -->
    <div class="color"></div>
    <div class="color"></div>
    <div class="color"></div>
    <div class="box">
        <!-- 背景圆 -->
        <div class="circle" style="--x:0"></div>
        <div class="circle" style="--x:1"></div>
        <div class="circle" style="--x:2"></div>
        <div class="circle" style="--x:3"></div>
        <div class="circle" style="--x:4"></div>
        <!-- 登录框 -->
        <div class="container">
            <div class="form">
                <h2>注册</h2>
                <form action="${pageContext.request.contextPath}/login" method="post">
                    <div class="inputBox">
                        <input id="uname" name="username" type="text" placeholder="请输入姓名">

                    </div>
                    <div class="inputBox">
                        <input id="pwd" name="password" type="password" placeholder="密码为学号">

                    </div>
                    <div class="inputBox">
                        <input id="btn" type="submit" value="登录">

                    </div>
                </form>

            </div>
        </div>
    </div>
</section>
<form action="${pageContext.request.contextPath}/login" method="post">
    用户名：<input type="text" name="username">
    密码：<input type="text" name="password">
    <input type="submit" value="提交">
</form>
</body>
</html>



